Saturday, Sep 1, 2012 - 3:00 AM
"Where Did We Come From?"
Scientists show how a supernova shock wave, sweeping through a cloud of dust and gas, could have played a part in forming the sun and planets. An English chemist has created conditions in which building blocks of RNA, probable precursor to DNA, assemble themselves naturally. After sucking human blood for millions of years, the DNA of lice hold a treasure trove of clues to human evolution.G